File:Penn carbondale 4-51.jpg
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![File:Penn carbondale 4-51.jpg](/images/thumb/b/b3/Penn_carbondale_4-51.jpg/662px-Penn_carbondale_4-51.jpg?20201223201828)
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Figure 4-51. Graphic columns of two sections in Fulton County, Illinois, illustrating the Delafield or Morgan School Member. Data from Wanless (1957). Note “extra” coal (Briar Hill?) in left column. © University of Illinois Board of Trustees.
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current | ★ Approved revision 20:18, 23 December 2020 | ![]() | 2,232 × 2,020 (645 KB) | Jennifer.Obrad (talk | contribs) |
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